Bump xunit.runner.visualstudio (#44010)

Bumps the dotnet group in /samples/snippets/core/testing/unit-testing-best-practices/csharp with 1 update: [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit.runner.visualstudio` from 2.8.2 to 3.0.0
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.8.2...3.0.0)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

samples/snippets/core/testing/unit-testing-best-practices/csharp/after/unit-testing-best-practices-after.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0" />
   </ItemGroup>
 
   <ItemGroup>

samples/snippets/core/testing/unit-testing-best-practices/csharp/before/unit-testing-best-practices-before.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0" />
   </ItemGroup>
 
   <ItemGroup>